1987 Chev Suburban Upgrade - Engine

Question: In short she has an excellent body but 240k mile and is a 3/4 ton 2x4 with a 350cc 5.7 F/I in her so she is getting tired. Maintenace and repairs (and gas) will only nickel and dime me so i was considering upgrading to a vortec 5.7/6.0 Is this even an applicable option? If so what would be a good year engine to search for and if not what are my options? She doesn't smoke runs well on the freeway however tends to foul out plugs quickly and tends to miss a lot on acceleration and i doubt that i am running on all 8 cylinders.

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Technican: 5-12-03. Hello, Did you like this truck when the engine had good power? Man, lots of issues concerning computers, their wiring harness requirements, transmission compatability (bolt pattern, tough enough for the bigger engine, rear end ratio factor) come into play here. You may find it cheaper to rebuild your engine, replace it with a 'TARGET' engine from a GM dealer, or, from some other reputable supplier. An upgrade means a 'blank check' until you cover every base. What is fouling the plugs? You said it doesn't smoke...
Owner: i believe oil is settling on soome of the plugs and not burning off distributer is new plus are bosch plat +4's but same problem as a standard Delco. I love the truck but she loves oil and gas. I cna't put her out of her misery so i have to try and fix her and i have no idea where the major problem is except old and tired.
Technican: 5-12-03. I'd start with a compression test and a good scope check of the ignition system. Plugs may be fouling from valve guide seals that are leaking. These are serviced without removing the heads from the block. Testing will guide your decision on which way to go, I sure couldn't begin any other way.

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